LU-12428 tests: fix sanity-sec wait_nm_sync

There are 2 different versions of wait_nm_sync in sanity-sec.sh,
because of a bad patch rebase.

Test-Parameters: trivial
Test-Parameters: combinedmdsmgs=true mdscount=2 mdtcount=4 osscount=1 ostcount=8 testlist=sanity-sec,sanity-sec,sanity-sec
Test-Parameters: combinedmdsmgs=true mdscount=2 mdtcount=4 osscount=1 ostcount=8 testlist=sanity-sec,sanity-sec,sanity-sec
Test-Parameters: combinedmdsmgs=true mdscount=2 mdtcount=4 osscount=1 ostcount=8 testlist=sanity-sec,sanity-sec,sanity-sec
Fixes: bb0a10752850 ("LU-11883 nodemap: make deny_unknown visible on default nodemap")
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I25edb19ce29b9380ad5721b550a6816899d9f95b
Reviewed-on: https://review.whamcloud.com/36009
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>